-21.26% is the change from 649 to 511
Calculation steps:
[( 511 - 649 ) ÷ 649] x 100 = -21.26%
Formula
Percentage change = [(511 - 649) / 649] x 100
Subtract the new number by the original number
511 - 649 = -138
-138 ÷ 649 = -0.21263482280431434
-0.21263482280431434 x 100 = -21.26%